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Questions tagged [redundancy]

Redundancy is the duplication of critical components or functions of a system with the intention of increasing reliability of the system, usually in the case of a backup or fail-safe.

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Node.js - Requiring mongoose here and there causes redundancy?

I have the following Node.js directory structure. |--app/ |--app.js |--routers/ |--index.js/ |--models/ |--schemas.js |--post.js In app.js, there's a line likes this mongoose.connect('mongodb://localhost/' +…
Trantor Liu
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Full recovery data using reed solomon

I'm testing a Reed Solomon algorithm from this repository in order to recover info in case something is externally changed. Assuming: m = bits per symbol k = data r = redundance n = bits per block = r + k = 2^m - 1 t = error correction = (n - k) /…
vgonisanz
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Redundancy, reliability and fault tolerance in C# - where to look for examples?

I want to learn how to create truly robust applications in .net - ones that are fault tolerant and are capable of withstanding unexpected situations. Where can I find literature/guidance on this subject? So far, I am not having much luck.
Dmitri Nesteruk
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How do I avoid redundant data fields in the result set when using JOINs?

Following join is supposed to retrieve user info along with their messages for users with a certain status: SELECT * FROM user, message WHERE message.user_id=user.id AND user.status=1 The problem is that all rows about a certain user in the result…
Ashkan Kh. Nazary
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redundant encoding?

This is more of a computer science / information theory question than a straightforward programming one, so if anyone knows of a better site to post this, please let me know. Let's say I have an N-bit piece of data that will be sent redundantly in…
Jason S
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C# Designer: Removing redundant code from Design.cs

I have a form which has several buttons, labels and other stuff on it, but the designer appears to remember old elements of that form that have previously be deleted. Is there anyway to 'refresh' the form.Designer.cs code to inform it what elements…
MeeMMeeM
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Can i use Google Apps as a fail-over mailserver?

I have my own exchange for emails. There are times when my exchange service is down (because of power failure or maintanance) and during this time, my users do not have access to the exchange web access. To keep the user experience consistant, I…
BTR Naidu
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Creating Redundancy for a Subversion Repository?

What is the best way to create redundant subversion repositories? I have a subversion repository (linked through apache2 and WebDAV) and would like to create a mirror repository on a different server in the event of outages, but I am not certain of…
kaybenleroll
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Redundancy Amazon S3 / Rails

We use amazon S3 buckets for publishing js files and putting them on client web sites. In other words, js files are stored in amazon s3. The main problem is since these files are on client sites, we don't want to give the client new js codes if…
Sait Mesutcan Ilhaner
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Should I opt for code repetition or consolidation with api service - JS

I'm working on a large CMS system where a particular module and its submodules take advantage of the same backend API. The endpoint is exactly the same for each submodule aside from its "document type". So a pattern like this is…
GHOST-34
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Change Azure Backup Vault Redundancy

We use Azure Backup and set our backup vaults to use GRS. We want to use LRS instead. It is understood that this cannot be changed once machines have been added to the vault, and we need to start from scratch. Two questions: Do I need to remove the…
Elliott
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Vowpal Wabbit Interaction Redundancy

I am curious about the way VW appears to create interaction terms, through the -q parameter. For the purpose of this illustration I am using this toy data, which is called cats.vm: 1 |a black |b small green |c numvar1:1.62 numvar2:342 |d cat |e…
B_Miner
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How does enterprise failover, such as with google.com, actually work?

We have a few fedora systems that are configured for web, FTP, and email services. We'd like to mirror these services, so that we can provide near 100% reliability for our users. I'm a fairly experienced Linux administrator, but don't have much…
Alex Regan
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Error correcting code

For a payment system that allows bank/wire transfers, I need to reliably associate payments with the corresponding user account that they are intended for. For this, the user should include a reference number on the transfer that is associated with…
Markus A.
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Including sparql sub-queries from separate files

Complex SPARQL queries are laborious to construct, and are difficult to read. Is there is way to `include' sub-queries in SPARQL, such as using an "include queryX" line, that would save one from writing out repetitive simple queries in separate more…
Rob Stewart
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